JUSTIN Bieber in a desperate bid to win back Selena Gomez?

JUSTIN Bieber is in a desperate bid to win back girlfriend Selena Gomez.

The singer partied at the Whisky River club in Charlotte, North Carolina following his concert on Tuesday night but was on his best behavior and friends believe he is trying to prove to Selena, 20, that he has grown up.

"Justin wasn't drinking," a source said.

"He was very polite, he was just chilling with his people. He arrived at 1.30am and the club closed at 2am so he wasn't here for long. He was on really good behavior; he was just relaxing and listening to music. He was having fun. A few fans asked for photos, and he was friendly with them. He wasn't flirty at all."

However, Selena has reportedly moved on after telling friends that Justin, 18, was too needy for her.

"Justin is super needy and can be a big baby around Selena. It's hard for him to make real friends because he likes the temporary attention of strangers, but didn't see how it hurt Selena," a source said.

"Selena didn't feel Justin was respectful of their relationship. She was constantly catching him in positions with other girls that would make her uncomfortable. She would get super jealous."

According to Star magazine, Bieber had a "night of debauchery" and "drug-fueled" hookup with a nursing student named Milyn Jenson on December 21, alledgedly cheating on Gomez and triggering their split.

Star cites a so-called "insider" as saying that : "Bieber joined Jenson and rapper pal Lil Twist at the Four Seasons in Beverly Hills that evening, before they all allegedly went to buy weed at a smoke shop in Hollywood."

Back at the hotel, says the tabloid's source, the trio "smoked pot" and made the street cocktail "sizzurp."

"The guys poured it into plastic cups and were drinking it throughout the night," alleges the Star source, who goes on to claim that at one point the group got into Bieber's Range Rover to visit the pop star's mansion in Calabasas, with Bieber allegedly driving "like a crazy person" on the way.

Justin Bieber goes off on woman at a gym?

Justin Bieber went off on Colette Harrington -- a NC radio host -- at a gym in North Carolina Tuesday. TMZ reports on the woman's claims. Harrington says Bieber ... mocked her workout, cussed at her ... and possibly even spit in her water bottle

According to Colette, Bieber arrived at the gym at the Ritz-Carlton Hotel with two other people -- one appeared to be his trainer and the other appeared to be a backup dancer or singer.

Colette says she approached Bieber and asked for a picture, but JB said no.

She says she continued working out, but then heard Justin and his friends mocking her workout routine.

Colette explains, "I always count out loud my reps. Then Justin starts imitating me and whenever I'd get to 20 he and his buddy would say 'Shut the F'ck up.'"

Colette says she ignored the group -- but claims they continued to mock her as she counted out her reps.

Then, according to Colette, someone ... and she thinks it was Bieber or someone in his group ... SPIT blue Gatorade into her water bottle while she wasn't looking ... and she actually DRANK the spit-orade.

"I did not look at my water bottle before taking a drink."

Colette says she filed a complaint with the hotel after the alleged incident.

Justin Bieber To Reveal All About Selena Gomez Split?

Justin Bieber is going to reveal the details of his relationship woes through song.

Justin Bieber's acoustic album "Believe Acoustic" drops on January 29 and apparently Justin will tell his side of the Selena Gomez break-up story.

Bieber tweeted, "now #6Days until I answer all the questions - #BELIEVEacoustic - #COUNTDOWN - #6Days."

The album will have three previously unheard songs and Bieber tweeted earlier this month, "...my acoustic album will let u know how I feel about what is going on in my life instead of rumors guessing. Put it in the music. Guess all u want I speak for myself."

Justin Bieber hates Selena Gomez's flirty friendship with James Franco?

Justin Bieber reportedly hates girlfriend Selena Gomez's flirty friendship with her Spring Breakers costar James Franco.

Justin, 18, went on the rampage after seeing pictures of Selena, 20, cozying up to the Oscar-nominated actor.

"Justin is steaming at Selena for striking up what he considers an inappropriate relationship with James," a source told the National Enquirer. "But he's directed most of his anger at James.

"Selena told him they're just friends and to stop acting like a spoiled child."

"Justin is under enormous stress, so he's acting out," said the source. "But Selena has warned him that she'll dump him if he throws another temper tantrum like this."